JP5430609B2 - Connected structure - Google Patents

Description

  The present invention relates to a connection structure for connecting two bars in a straight line in various tree structures.

  In various wooden structures such as wooden construction, metal fittings are sometimes used to connect rods together. The shape of this metal fitting varies depending on the application and purpose, but when two bars such as a column and a horizontal member are connected in a letter shape, a U-shaped one is often used. The U-shaped metal fitting is formed by bending a steel plate at two locations, and includes a central plate located in the center and side plates protruding at right angles from the left and right sides of the central plate. The central plate is drawn to the bar through bolts or the like, while the side plate is inserted into two rows of grooves processed at the end of the bar. In addition, as a specific example of this metal fitting, Patent Document 1 is cited.

  In addition, metal fittings have also been developed for connecting the end faces of two bar members in a straight line. Specific examples thereof include Non-Patent Document 1 in addition to Patent Document 2 and Patent Document 3. The metal fitting disclosed in Patent Document 2 is configured to be inserted so as to straddle two bars, and to be integrated with the bars with a pin or the like. In addition, in addition to a groove for inserting a metal fitting, a hole for inserting a pin or the like is processed in advance in the bar. Moreover, the metal fitting currently disclosed by patent document 3 can arrange | position so that it may oppose each bar, and can give prestress to a connection part by the structure which draws this with a volt | bolt. Further, Non-Patent Document 1 discloses a structure in which two U-shaped metal fittings are joined back to back.

JP 10-33260 A JP 2000-54488 A JP 2007-217949 A Design Registration No. 1163374

  The connecting part between bars is extremely important to ensure the strength of the structure, and the metal fittings built into the bar take into account various factors such as strength, secular deformation and workability of the bar. It is necessary to select. In order to secure the strength of the connecting portion, it is preferable to fix the metal fitting and the bar in an immobile state, and a method of pulling the metal fitting with a bolt as in Patent Document 1 is excellent. On the other hand, when the bracket and bar are integrated with a drift pin, etc., considering the processing accuracy and workability during construction, there is often room for the diameter of the round hole into which the drift pin is inserted. , There are disadvantages.

  The metal fittings disclosed in Patent Document 2 and Non-Patent Document 1 are configured to be integrated with any of the two bar members to be connected by a drift pin or the like. Therefore, as described above, there is often a margin in the diameter of the round hole into which the drift pin or the like is inserted. Also, grooves for inserting metal fittings are often cut larger than necessary due to cost and processing equipment. When these factors overlap, loosening occurs in the connecting portion after construction, which may reduce the strength of the structure.

  The metal fitting disclosed by patent document 3 can give a prestress to a connection part, and a slack does not generate | occur | produce. Therefore, although it is excellent in strength, there are disadvantages in terms of cost and labor, such as increasing the number of parts by arranging the metal fittings opposite to each other and accompanying the work of generating prestress during construction.

  The present invention was developed on the basis of such circumstances, and it is an object to provide a connection structure that can suppress a decrease in rigidity by eliminating loosening between a metal fitting and a bar when connecting two bars in a straight line. It is said.

  The invention according to claim 1 for solving the above-described problem is an H comprising two bar members whose end faces are in contact with each other, two side plates arranged in parallel and a central plate integrating the side plates. A metal fitting having a shape, and a fixture for integrating the metal fitting and the bar, and provided with two rows of slits at the end of each bar to insert the side plate, and an end face of the bar Is provided with a step portion for accommodating the central plate, and an insertion tool is incorporated in at least one of the two spaces where the central plate and the end face of the bar face each other. It is a connected structure.

  The present invention aims to secure the rigidity of the connecting portion by suppressing the loosening of the metal fitting and the bar as much as possible in the connecting structure that connects the two bars in a straight line. It is assumed that it is wooden including. The metal fitting has an H shape composed of two side plates arranged in parallel and a central plate that integrates the two side plates substantially in the middle of the two side plates. At the end of each bar, two rows of slits for inserting the side plates are processed, and a stepped portion where the center of the end surface is shaved is processed in order to accommodate the central plate. The step portion is processed only in the range connecting the two rows of slits, but there are cases where the step portion is processed only to one bar material or both bar materials are processed.

  In order to integrate the metal fitting and the bar material, the fixture is a rod-shaped member penetrating the metal fitting and the bar material, and is inserted from the side surface of the bar material. Specific examples of the fixing tool include a drift pin and a bolt. In the case of the drift pin, after being inserted, it is held by friction with a bar. In the case of bolts, a nut is attached to the tip side to prevent it from coming off. In order to insert the fixture, a pin hole or the like is formed in the side plate of the metal fitting at the manufacturing stage, and a horizontal hole is processed in the bar material at a position concentric with the pin hole or the like. It should be noted that only one fixture cannot resist the bending moment. Therefore, it is assumed that a plurality of bars are used for one bar.

  The insertion tool is installed in a space where the central plate of the metal fitting and the end face of the bar are opposed to each other, and contacts both the central plate and the bar to fill the space. In order to accommodate the center plate, it is necessary to process the stepped portion on the end face of the bar as described above. From the viewpoint of the strength of the connecting portion, it is preferable to process the stepped portion with high accuracy so that the center plate and the bar are in close contact with each other. However, in reality, the stepped portion is often deeper than necessary due to cost and processing equipment. Therefore, both surfaces of the center plate do not always come into contact with the end surface of the bar, and a certain amount of space is generated at this location, and the metal fitting is easily displaced with respect to the bar.

  By incorporating it in this space with an insertion tool, the bracket and bar are integrated and rigidity is improved, and the pressure acting on the interface between the center plate and bar is dispersed over a wide range, and the bar deforms over time. Is suppressed and loosening of the metal fittings can be eliminated. Specific examples of the insertion tool include a metal plate that enters the space and a screw nail head. Further, the insertion tool may be incorporated on both sides of the center plate or may be incorporated only on one side.

  When a metal plate is used as an insertion tool, its size and thickness can be adjusted freely, so it is possible to select the most appropriate one according to the shape of the space without difficulty, and it is securely connected without affecting the workability. The looseness of the part can be eliminated. Note that the metal plate can be made as large as the center plate to fill almost the entire space, but depending on the conditions, it may be limited to a part such as the lower half. In addition, when a metal plate is assembled, it can be attached with an adhesive, but a countersunk screw or the like can also be used.

  When a screw nail is used as an insertion tool, it is possible to easily cope with a change in the thickness of the space by adjusting the screwing amount. If only one screw nail is used, the load increases locally and deformation of the bar is expected. Therefore, it is preferable to use a plurality of the same space.

  As in the first aspect of the present invention, the metal fitting and the bar are brought into close contact with each other by interposing the insertion tool in the space where the center plate of the metal fitting and the end surface of the bar are opposed to each other. Looseness with the material is eliminated, and a decrease in rigidity of the connecting portion can be suppressed. Moreover, since the load transmitted between the metal fitting and the bar is dispersed over a wide range by the insertion tool, the stress acting on the end face of the bar does not increase locally. For this reason, the bar can be prevented from being aged and the rigidity of the connecting portion is not lowered. Moreover, the present invention has a simple configuration and is advantageous in terms of cost.

It is a perspective view which shows the specific example of the connection structure by this invention. It is a perspective view which shows the middle step which assembles each element of FIG. It is a perspective view which shows the state which connected two horizontal members in the last stage of FIG. It is the longitudinal cross-sectional view of the connection structure of FIG. 3, AA sectional drawing, and BB sectional drawing. It is a perspective view which shows the connection structure different from FIG. It is a perspective view which shows the case where a screw nail is used as an insertion tool.

  FIG. 1 shows a specific example of a connecting structure according to the present invention. The connecting structure according to the present invention is for connecting two bars in a straight line. In this figure, two horizontal members 21 and 31 laid horizontally are used as bars. The left horizontal member 31 in the figure is supported by a column 51, and the right horizontal member 21 is supported by the left horizontal member 31 via the metal fitting 11. The metal fitting 11 is formed by bending a steel plate into a U-shape and arranging them back to back and integrating them by welding. The metal fitting 11 is composed of two rows of side plates 14 and a central plate 13 connecting the middle. , H shape when viewed from above or below.

  In order to insert the side plate 14 of the metal fitting 11, two rows of slits 22 and 32 are processed at the ends of the horizontal members 21 and 31. The slits 22 and 32 pass through the upper and lower surfaces of the horizontal members 21 and 31 and have a depth sufficient to allow the entire side plate 14 to be inserted. Further, in order to accommodate the center plate 13, stepped portions 23 and 33 are processed on the end surfaces of the horizontal members 21 and 31. The stepped portions 23 and 33 are cut out only between the two rows of slits 22 and 32, but considering the workability, the total cutting depth becomes larger than the thickness of the central plate 13. Yes.

  Drift pins 28 and 38 are used for the fixture that integrates the metal fitting 11 and the horizontal members 21 and 31. The side plate 14 of the metal fitting 11 is provided with two sets of upper and lower pin grooves 16 and a total of four sets of pin holes 18 in a point symmetrical manner so that the drift pins 28 and 38 can be inserted. Further, lateral holes 24 and 34 are machined on the side surfaces of the horizontal members 21 and 31 at positions concentric with the pin grooves 16 and the pin holes 18. The horizontal holes 24 and 34 reach the opposite surface, and three each are arranged vertically.

  A metal plate 41 is used for the insertion tool incorporated in the step portions 23 and 33. In this figure, the metal plate 41 is disposed only below the step portion 23 in consideration of a downward load acting on the right horizontal member 21. The metal plate 41 fills the space between the central plate 13 and the stepped portion 23 so that both are substantially integrated. Therefore, the minute looseness of the connecting portion is eliminated, the decrease in rigidity can be suppressed, and the load straddling both horizontal members 21 and 31 is directly transmitted. A countersunk screw 45 is used to incorporate the metal plate 41. The head of the countersunk screw 45 is buried in the metal plate 41 and does not interfere with the metal fitting 11.

  FIG. 2 shows a stage in the middle of assembling the elements shown in FIG. After the side plate 14 is inserted into the slit 32 of the left horizontal member 31, the drift pin 38 is driven through the horizontal hole 34, and the metal fitting 11 and the horizontal member 31 are integrated. Further, with respect to the right horizontal member 21, the drift pin 28 is driven only in the uppermost horizontal hole 24, and a metal plate 41 is attached with a countersunk screw 45 below the stepped portion 23. Thereafter, when the right side horizontal member 21 is lifted and its end surface is moved upwardly of the metal fitting 11 and gradually lowered, the side plate 14 is inserted into the slit 22 and is finally driven into the drift pin 28. Is received by the pin groove 16, and the temporary placement of the horizontal member 21 is completed.

  FIG. 3 shows a state in which two horizontal members 21 and 31 are connected in the final stage of FIG. The entire metal fitting 11 is embedded in the slits 22 and 32 and the step portions 23 and 33, and the drift pins 28 and 38 are also embedded in the horizontal holes 24 and 34, and only these end portions can be visually recognized from the outside. . Since the metal plate 41 is sandwiched between the horizontal members 21 and 31, the metal plate 41 is hardly visible from the outside. Thereafter, the downward load acting on the right horizontal member 21 is transmitted to the left horizontal member 31 via the metal fitting 11 and finally received by the column 51.

  FIG. 4 shows cross sections of the connection structure of FIG. As shown in the longitudinal sectional view of the central portion, the central plate 13 of the metal fitting 11 has a shape in which two steel plates overlap each other. Further, since the stepped portions 23 and 33 are deeply cut, the central plate 13 is not in contact with the end surfaces of the horizontal members 21 and 31 and a certain space is formed. If the entire area of the central plate 13 is not in contact with the horizontal members 21 and 31, load transmission is concentrated on the drift pins 28 and 38, so that the metal fitting 11 and the horizontal members 21 and 31 may be deformed. However, in this connection structure, a single metal plate 41 is sandwiched below the space, so that the movement of the metal fitting 11 can be restrained and the compression load is transmitted.

  FIG. 5 shows a connection structure different from that in FIG. In FIG. 1, the step portions 23 and 33 are processed into the horizontal members 21 and 31. However, in this figure, the stepped portion 33 of the right horizontal member 21 is eliminated by deeply processing the stepped portion 33 of the left horizontal member 31. Even in such a case, it is possible to attach the metal plate 41 to the end surface of the horizontal member 21. In addition, the metal plate 41 can be attached to both horizontal members 21 and 31 as shown in the figure, and the size thereof is arbitrary, and the height of the horizontal members 21 and 31 may be the same.

  FIG. 6 shows a case where a screw nail 43 is used as an insertion tool. As for the insertion tool, a screw nail 43 can also be used as shown in this figure, in addition to the metal plate 41 used in the drawings so far. Since the head of the screw nail 43 contacts the central plate 13 of the metal fitting 11, the metal fitting 11 can be prevented from being displaced, and the load is transmitted. In addition, by adjusting the screwing amount of the screw nail 43, the center plate 13 can be contacted without affecting the workability. Further, the screw nails 43 are preferably arranged as densely as possible so as to function appropriately as an insertion tool. In this figure, a total of three screw nails 43 are screwed into the stepped portion 23 of the right horizontal member 21.

11 Bracket 13 Center plate 14 Side plate 16 Pin groove 18 Pin hole 21 Horizontal member (bar)
22 Slit 23 Stepped portion 24 Horizontal hole 28 Drift pin (fixing tool)
31 Horizontal material (bar material)
32 Slit 33 Stepped portion 34 Horizontal hole 38 Drift pin (fixing tool)
41 Metal plate (intermediate tool)
43 Screw nails (interposer)
45 countersunk screws 51 pillars

Claims (1)

An H-shape consisting of two bars (21, 31) whose end faces are in contact with each other, two side plates (14) arranged in parallel and a central plate (13) integrating the side plates (14). A metal fitting (11), and a fixture (28, 38) for integrating the metal fitting (11) and the bar (21, 31), and at the end of each bar (21, 31) In order to insert the side plate (14), two rows of slits (22, 32) are provided, and the end surface of the bar (21, 31) has a stepped portion (23 for accommodating the central plate (13)). 33), and an insertion tool (41 or 43) is incorporated in at least one of the two spaces where the end faces of the central plate (13) and the bar (21, 31) face each other. Connecting structure characterized by

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